Hadley is an impact crater in the Aeolis quadrangle of Mars, located at 19.5°S latitude and 203.1°W longitude, and is inside Terra Cimmeria. It is 119.0 km in diameter. It was named after British meteorologist George Hadley; the name was approved in 1973.[1] Dunes are present on the floor of the crater and can be seen in the pictures on the left.